Burnishing or polishing machine.



No. 700,642. Patented May 20, I902.

0. A. HANFDRD.

BURNISHING 0R POLISHING MACHINE.

(Application fiLed Aug. 12, 1901.)

(No Model.)

UNITED STATES PATENT @FFICE.

ORIN A. HANFORD, OF \VOBURN, MASSACHUSETTS, ASSIGNOR TO CHARLES A.GRIDLEY AND GEORGE BERNARD, OF BOSTON, MASSACHUSETTS.

BURNISHING OR POLlSl-HNG MACHlNE.

SPECIFICATION forming part of Letters Patent No. 700,642, dated May 20,1902.

Application filed August 12, 1901. Serial No. 71,813. (No model.)

To (ti/Z whom it may concern.-

Be it known that I, ORIN A. HANFORD, of Woburn, in the county ofMiddlesex and State of Massachusetts, have inventedcertain new anduseful Improvements in Burnishing or Polishing Machines, of which thefollowing is a specification.

This invention has relation to polishing or burnishing machines, havingfor its object to provide an apparatus which can be used to impart ahigh polish to metallic surfaces with the least possible effort on thepart of the operator.

In carrying out the invention I employ an t5 electric motor the framingof which is provided with handles, whereby it can be readily used,andpolishing or bu rnishing material secured in a chuck attached to thearmatureshaft.

Referring to the accompanying drawings,

Figure 1 represents in front elevation a burnishing-machine embodying myinvention. Fig. 2 represents a side elevation of the same. Fig. 3represents a front elevation with a portion of the casing removed. Fig.4 represents a longitudinal section through the machine.

On the drawings is illustrated a bufiing-machine consisting of anelectric motor, a buffing or polishing device mounted upon thearmature-shaft of the motor, and handles whereby the apparatus may beeasily manipulated.

Any suitable form of motor may be employed, although for all generalpurposes I have found the one which I have illustrated to be bestadapted for my purpose. This motor consists of the two pole-pieces a a,connected by the core Z), around which are the coils b. The pole-piecesa a form the ends of a casing, the sides of the casing being formed bythe plates 1 g, which are bolted or screwed thereto, as shown at g. Thebottom of the casing consists of the plate 01, which is secured to theends of the pole-pieces which project beyond the coils Z). Thus thecoils are inclosed within a comparatively tight casing. A cross-bar c,which may be of diamagnetic and non-conducting material, is seen redtothe-free ends of the poles by screws 0 0, so as to brace them and toform means of at- The crosstachment for a pivoted handle 6.

bar 0 is provided with the lugs 0 to which is attached a handle 6 bymeans of a pintle e. Preferably the body of the handle is formed ofwood; but it is obvious that any other suitable non-conducting materialmay be employed. A handle fis rigidly attached to the cross-plate (J,said handles a andfnormally extending at opposite directions, so as tobe grasped by the two hands. 30

The armature-shaft for the motor is indicated at h, and it carries thearmature h and also the commutator, (indicated more or lessconventionally at 7L3.) At one end the armature-shaft is journaled in abracket r', attached to the rear face of the pole-pieces, this bracketforming an end-thrust bearing for said shaft, the said shaft beingprovided with a shoulder 712 for this purpose. Suitable brushes to bearagainst the commutator are attached to the bracket 7;, said brushesbeing indicated conventionally at 7c. The other end of thearmature-shaft is journaled in an annular shell j, attached to the frontface of the pole-pieces. This shell has the outer annular flange j andthe boss j The end of the sh aft is threaded to receive a chuckconsisting of the flanged disk m, in which is forced a ring 02, as shownin Fig. 4. The buffing or polishing pad 0 may be secured to the ring endin any desired way. Usuallylhave formed the ring of wood and glue orcement the pad to it; but it may be understood that I may employ anyother form of chuck which may be found suitable for the purpose.

The boss is adapted to receive pressure from the rear faces of thechuck, so that the said boss j assists the brackets '2; in holding thearmature-shaft against longitudinal displacement. lhave not indicatedconventionon ally or otherwise the electric circuit, since the motor, sofar as general features and connections are concerned, does not differfrom those hitherto employed. So far as I am aware, however, I believethat I am the first to pro- 5 vide a portable motor carryingupon itsarmature-shaft a chuck for the reception of buffing or polishingmaterial and handles attached to the motor in such way that the lattermay be easily manipulated, so as to press the buff- ICO ing-bladeagainst the material to be buffed or polished.

In Fig. 2 I have shown a flexible conductor p, of which there may be twofor supplying the motor with current. The conductor 011 its end isequipped with a member which may be inserted in an electric-lightsocket, the saidmembernotbeingshown. Theconductor is preferably longenough so that the motor may be connected to the most convenient socket,whereby the apparatus may be employed for burnishing and polishing brasssigns or plates at the front of stores, offices, or dwellings.

By hinging the handle 6 the apparatus may be more readily manipulatedthan if the two handles were rigid, and it is thereby possible to reachsurfaces comparatively inaccessible much more readily than if thehandles were incapable of movement relatively to each other.

Having thus explained the nature of the invention and described a way ofconstructing and usingthesame,although without attempting to set forthall of the forms in which it may be made or all of the modes of its use,I declare that what I claim is 1. A portable bu fling or polishingapparatus,

comprising an electric motor, a buffer carried and operated by saidmotor, and a handle pivotally attached to said motor whereby the buffermay be manually pressed against the material to be buffed or polished.

2. Aportable buffing or polishing apparatus, consisting of an electricmotor, oppositely-disposed handles attached to said motor whereby it maybe easily manipulated, one of said handies being pivotally connected,and a chuck carrying a buffer and carried by the armatureshaft of saidmotor,substantially as described.

3. A portable bufling or polishing apparatus consisting of an electricmotor having crossbars attached to the pole-pieces at opposite sides ofthe armature of the motor, handles attached to said cross-bars, and achuck carrying a buffer and carried by the armatureshaftofsaidmotor,substantially as described.

In testimony whereof I have alfixed my sig' nature in presence of twowitnesses.

ORIN A. IIANFORD. Witnesses:

M. D. MAY, 0. O. Srncimn.

